My band just got new powered mains for our sound system. So instead of using the speaker cables we had for our passive speakers, we are switching to XLRs. A few of the guys stated they want "high quality" XLR cables for them. As a guitar player, I've encountered the age old patch cable hype, and the science over and over again just tells me don't buy the hype: it's all about capacitance. However, with XLRs we are talking about a balanced signal. My gut reaction is still to say "bull crap" and reject getting the new cables in hopes that they will somehow retain fidelity better than the XLR cables we already have, but I don't know the science here. Is it possible for certain XLR cables to retain signal quality better than others, and if so how does one determine that?